Aquatic Ecosystem Quiz

What percentage of the Earth's surface is covered by water?

• 80%

• 90%

• 70%

• 50%

What is the main component of water?

• Oxygen and Carbon

• Hydrogen and Helium

• Hydrogen and Oxygen

• Hydrogen and Nitrogen

What is the process that leads to the formation of rain in the water cycle?

• Transpiration

• Evaporation

• Condensation

• Infiltration

What is the pH value of pure water?

• 10

• 14

• 7

• 4

Which of the following is a characteristic of water's polarity?

• It has a neutral charge

• It is a solid at room temperature

• It cannot dissolve salts

• It can form hydrogen bonds

What happens to the pH of water when the concentration of hydrogen ions increases?

• It becomes basic

• It becomes neutral

• It becomes acidic

• It remains unchanged

Which of the following is a source of fresh water?

• Seas

• Rivers

• Salt lakes

• Oceans

What is the effect of acid rain on rocks?

• It decomposes them

• It makes them more solid

• It strengthens them

• It has no effect

What is the main reason for the higher boiling point of water compared to hydrogen sulfide?

• Water's molecular weight

• Water's ability to form hydrogen bonds

• Water's acidity

• Water's density

Which of the following factors can affect the pH of groundwater?

• Rock structure

• Temperature

• Humidity

• Wind speed